Sector-cutting saw.



K. PETERSON.

SECTOR CUTTING SAW.

APPLICATION FILED APR. 3, 1909.

1,023,959, Patented Apr. 23, 1912.

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SECTOR CUTTING SAW.

APPLICATION FILED APR. s, 1909.

1,023,959. Patented Apr. 23,1912.

3 SHEETSSHEBT 2.

K. PETERSON.

SECTOR CUTTING SAW.

APPLICATION FILED APR. 3, 1909.

Patented Apr. 23, 1912.

3 SHBETSSHEBT 3.

UNITED STATES PATENT OFFICE.

KARL PETERSON, 0F JAMESTOWN, NEW YORK.

SECTOR-GUTTING SAW.

Specification of Letters Patent.

Patented Apr. 23, 1912.

Application filed April 3, 1909. Serial No. 487,781.

vention is to. provide a saw having controlling mechanism whereby it will cut a sector, and the novelty consists in the construction and arrangement of the parts as. hereinafter described in this: specification and pointed out in the claims and shown in the accompanying drawings.

In the drawings- Figure 1 is a top plan view of the machine. Fig. 2 is side elevation of the machine showing a wrench thereon in position for slotting the head. Fig. 3 is a detail side elevation of the mechanism for giving an intermittent motion to the clamp for holding the work. Fig. 4 1s a detail of the clamp and saw, the wrench being shown in dotted outline. Fig. 5 is a plan View of thecam shaped feed plate and showin the roller in dotted line. Fig. 6 is a si e elevation of the wrench with the head in section; and Fig. 7 a perspective view showing the radial slot in the head portion. Fig. 8 is a side elevation of the worm and worm gear. Fig. 9 is a side elevation of the reciprocating shaft showing its swing support at one end and pivotal support for the other, the pan and one of the shafts being shown in section; also giving a sectional view of the catch for the starting bar in order to show its construction. Fig. 10 is a side elevation of the gear and swing supported end of the reciprocating shaft, the swing, spring pm, and boxing, and the handle for the end of the shaft with a portion of the pan being shown in section. Fig. 11 is a side'elevation of the catch for the starting bar showing the bar in section as it passes through said catch.

Similar numerals refer to corresponding parts in the several views.

The numeral 10 indicates the frame which is preferably made of cast metal so as to form a firm foundation. The frame 10 s11pports a pan shaped top 11 thereon, within which the saw and the controlling mechanism therefor 1s mounted.

The numeral 12 indicates the metal cutting saw which is secured in the end of :1V holder 13 by means of a suitable hand screw,

which holder is secured in the end of a slidably mounted plate 14 by a set screw. The plate 14 is slidably mounted by means of top frame plate 15. and lower frame plate 16 which have sliding ways therein to receive the vertically placed plate 14. The lower plate 16. has the guide bar '17 mounted in one end, which guide bar is held at its opposite end by means of a block 18 and sustains thereon the two slotted guide blocks 19 and 20., which are made adjustable on rod 17 so that they may be placed on opposite sides of the article to. be sawed or slotted. The plate 14: is given a reciprocating movement by naeansof pitman 21 and crank wheel 22, different holes 23 being provided in said crank wheel to obtain adjustment of the speed and length of stroke of the pitman for the reciprocation of the saw 12. The wheel 22 is revolved by means of gear 2 1 on shaft 25. which shaft bears on the opposite end the driving pulley 26.

As is well known, in order to obtain the highest efficiency, saws are usually constructed to out in only one direction. In order that a suitable clamp. or work holder may be provided which shall have an intermittent rotary feed against the saw when it moves in the cutting direction, a sector shaped plate 27 is provided, which plate is mounted on a revoluble shaft 28 near the point or diminished portion of the radial sector. The plate 27 is placed at one side of the saw 12 and adjacent thereto so that clamping mechanism may be attached to said plate; as for example, in clamping the head of a wrench 2,9v in order to out a sector shaped slot in the same, a slotted block 30 is provided on plate 27 which fits a portion of the wrench head and a cam shaped locking portion 31 is pivotally mounted opposite said block 30, so that by turning clamping block'3l by means of handle 32, the wrench head is held firmly against block 30 in position to. receive saw 12 therethrough and in line with the slots in guide blocks 19 and 20 on each side thereof. Let it be understood that it is desired to slot these wrench heads in the form of a sector, as shown in Figs. 6 and 7, the plate 27 moving a sector shaped segment of a circle. It is apparent that plate 27 might be arranged to cut larger segments, turning around a given center, which point would be the center of the shaft 28 upon which plate 27 is keyed.

In order to give plate 27 the desired in termittent reciprocating rotary feeding movement, a cam 45 is keyed on cross shaft 44 opposite the capped end 40 of a shaft 38. Cam 45 is made with a smaller portion 68 forabout one-half of its circumference, and a larger portion 69 for nearly the other half, the inclined connective parts 67 comprising the remainder of the circumference of cam 45. The cap 40 of shaft 38 is pressed by a spring 57 against the periphery of cam 45 so that when cam 45 is rotated by shaft 44, shaft 38 is given a reciprocating movement at each of the changes 67. from the larger to the smaller and from the smaller to the larger circumference.

The coil spring 57 is contained within a yoke 39 around shaft 38 which yoke is attached to journal 56 by trunnions. A ring 58 is attached to shaft 38 and acts as a compressor of said spring 57 when the shaft moves endwise so that the spring 57 in yoke 59 continually presses shaft 38 endwise against cam 45. i

A. friction disk 41 is slidably mounted on shaft 38 just inside of cap 40 with a feather key so that while it can slide back and forth on shaft 38 it will also turn it. A friction wheel 43 is keyed on shaft 44"opposite a portion of the faceof the friction disk 41 near its periphery. The radius of the friction wheel 43 is less than the radius of the larger portion 69 of cam 45 plus cap 40 and said radius of friction wheel 43 is greater than the radius of the smaller portion 68 of cam 45 plus cap 40; in consequence when shaft 44 is revolved cam 45 will press disk 41 away from friction wheel 43 for the length of portion 69 of the circumference of cam 45 and will permit friction disk 41 to contact friction Wheel 43 for the length of smaller portion 68 of the circumference of cam 45, and the pressure of spring 42 against disk 41 causes the frictional cont-act of disk 41 and friction wheel 43 to turn disk 41 and shaft 38. Accordingly the rotation of cam 45 gives a reciprocating movement at each change 67 of cam 45 or twice during said rotation, and said rotation of shaft 44 will turn disk 41 and shaft 38 for nearly.

one-half of the rotation of cam 45 or the length of the smaller portion 68 of cam 45;

38 and journal 56 may pivotally turn on withdrawn, shaft 38 and its journal 62 drop down onto yoke 59 thereby separating gear 36 from worm 37 and allowing cam 33 and plate 27 to be returned to the starting position, after which shaft 38 and journal 62 are raised above pin 60. Pin 60 is preferably made a spring pin and the lower edge of the pin is beveled so that it is only necessary to manually raise the shaft by end 61 and the spring pin 60 automatically catches and holds the shaft and journal in position.

For a thorough understanding of the operation of the machine it should be recognized that the feed of the work against the saw requires that said work must be pressed against the saw during its effective or cutting movement and dropped away from the saw during the ineffective return movement of said saw, and this is accomplished in the present device by means of a series of shafts, a friction wheel, a disk and cam that gives an intermittent compound rotating and reciprocating movement to the princi pal shaft, which movement is imparted to the work through a suitable worm and pinion and a second cam.

The operation of the machine 15 as follows: The reciprocation of the saw 12 has been described. It should be borne in mind that during the return or ineffective movement of the saw 12, the work is dropped away from the saw, and as the saw makes its effective or cutting movement, the work is raised toward the saw a distance slightly greater than that through which it was dropped, said distance being slightly greater at one end of the out than at the other so as to make a sector-shaped cut. This feeding movement is accomplished in the following manner: Power is applied through pulley 26 to shaft 25, to which shaft, gear 24 is at taohed, which meshes in gear 22 and turns the same gear 22 is attached to the end of shaft 44 and turns said shaft, thereby rotating cam 45 and friction wheel 43. The smaller portion 68 of cam 45 permits friction wheel 43 to rotate friction disk 41 and shaft 38. The inclines 67 on cam 45 impart a reciprocating movement to shaft 38. The larger portion 69 of cam 45 holds friction disk 41 outof contact with friction wheel 43 and thereby stops the rotation .of shaft 38 for the length of said larger portion 69, thus giving shaft 38 an intermittent reciprocating and rotating movement. This movement is communicated to the wrench part 29 by means of the worm 37 on shaft 38, pinion 36 on shaft 34 and cam 33 on shaft 34 which bears against roller pin 35 on plate 27, which plate 27 supports wrench part 29.

It is apparent that the rotation of shaft 38 (hiring a portion of the rotation of cam 45 will cause worm 37 to turn pinion 36 and thereby press cam 33 against roller pin 35 moving said roller up a slight distance. The length of said larger portion 69 of cam 45 is proportioned to the length of the cut which it is desired that the saw 12 shall make, hence the upward pressure of cam 33 on pin 35 continues throughout said cutting movement of the saw. lVhen the end of the said cutting movement is reached the incline 67 on cam 45 moves shaft 38 endwise, thereby imparting as it were a rack and pinion movement to worm 37 and pinion 36 and simultaneously moving disk 41 out of touch with friction wheel 43. The rack and pinion movement of worm 37 and pinion 36 causes cam 33 to drop back a sufiicient dis tance to relieve the pressure of the work on saw 12 and this continues during the return movement of the saw or the length of the smaller portion 68 of cam 45, at which point the other incline 67 permits the spring pressed shaft 38 to move back toward cam 45, thereby permitting friction disk 41 to turn shaft 38 and press cam 33 up against roller 35 and pressing the work against the saw; and this series of movements is repeated until the sector-shaped slot is cut in the wrench part 29.

As hereinbefore described the cam 33 is given an intermittent reciprocating and rotating movement by cam 45 and the connective parts. Cam 33 presses against roller pin 35 thereby gradually raising it and the work with an intermittent feed against the saw 12. The revolution of cam 33 continues until pin 35 reaches the point of cam 33, when the pin drops down to the position shown in dotted line in Fig. 5. returns plate 27 to the beginning of its feeding position for the feeding of a new sector of ti-shaped cut. The reciprocating movement of the cam necessitates a notch 66 in the side of the cam to accommodate the roller pin 35 so that it can have perfect freedom to roll back and forth. In order to start and automatically stop said intermittent mot-ion and the machine, a starting bar 46 is provided which is connected with the bell crank 47, which bell crank is connected to a clutch 48 attached to pulley 26 on shaft 25, a spring 49 being attached to one arm of bell crank 47. A pin 50 is provided on shaft 28 directly under starting bar 46. Then it is desired to start the machine, lever 46 is raised and pushed forward until notch 51 engages This drop a guide catch 52. As hereinbefore described the shape of cam 33 is such that it raises plate 27 by an intermittent movement from cam 45 until pin 50 is turned up into contact against the under side of bar 46 and raises the same and allows spring 49 freedom to operate bell crank 47 and clutch 48, thereby automatically stopping the machine. Vhen the machine stops the sector-shaped slot has been completed so that the work may be removed and a new wrench part or other piece of work clamped in place upon plate 27.

In many of the different forms of slotting by sawing, the pull of the saw is sufficient to give tension to the saw 12 as it is guided in blocks 19 and 20, but in some forms of work it is necessary to give a constant tension to the saw. This is attained by means of a frame consisting of a projection 53 on plate 14 and a rod 54 keyed in projection 53 by means of a suitable set screw, which rod has an arm 55 which engages the opposite end of saw 12 from that engaged by holder 13. It is now apparent that the desired tension may be given to the saw 12 within this slidably mounted frame so that it may be either pushed or pulled in operating the saw and may cut in either direction.

The cutting edge of the saw 12 is placed on a line with the center of the shaft 28 to which plate 27 is attached, in consequence the rotation of plate 27 by cam 33 pressing against roller pin 35, which roller pin is placed near the periphery of the sectorshaped plate 27 will cause the saw 12 to cut a sector-shaped slot in the work which is firmly held upon plate 27, the size of the sector depending upon the position of the work on the plate 27, or its distance from the center of shaft 27.

I claim as new:

1. In a device of the character described, a cutting tool and means for giving a reciprocating movement thereto, holding means for the work alongside said cutting tool, and a rotary feed for said holding mechanism and work against the edge of said cutting tool and around a point adjacent said edge.

2. In a device of the character described, a saw and means for reciprocating the same, holding mechanism for the work alongsidesaid saw, rotary feed for said holding mechanism and work against the cutting edge of said saw and around a point adjacent said cutting edge, and means for giving said rotary feed an intermittent movement.

3. In a device of the character described, a saw and means for reciprocally moving the same, aholding clamp revolubly mounted alongside said saw, a cam revo-lubly mounted adjacent to said holding clamp to raise the same, and means for turning said cam with an intermittent movement to raise said holding clamp and feed the work against said saw.

4. In a device of the character described, a saw and means for reciprocally moving the same, a first revolubly mounted shaft having an end adjacent said saw, a holding clamp on said adjacent shaft end, a second shaft revolnbly mounted parallel to said first shaft, a cam on said second shaft ad jacent said holding clamp to raise said clamp, a third shaft, a worm and gear connection between said second and third shafts, and means for intermittently moving said third shaft to give an intermittent motion to said cam and holding clamp.

In a device of the character described, a saw and means for reciprocally moving the same, a first revolubly mounted shaft having an end adjacent said saw, a sector shaped holding clamp on said adjacent shaft end, a second shaft revolubly mounted parallel to said first shaft, a cam on said second shaft adjacent said sector shaped holding.

clamp to raise the same, a third shaft revolubly and slidably mounted at rightangles to said second shaft, worm and gear connect-ion between said second and third shafts, and means for intermittently turning and reciprocallay moving said third shaft.

6. In a device of the character described, a saw and means for reciprocally moving said saw, a holding clamp revolubly mounted adjacent said saw, a cam revolubly mounted adjacent said holding clamp to raise the same and means for oscillatively turning said cam to alternately feed the work against and then relieve said saw.

7. In a device of the character described, a saw and means for reciprocally moving the same, a revoluhly mounted holding clamp for the work adjacent said saw, a shaft revolubly mounted adjacent to said holding clamp, a cam on said shaft to raise said holding clamp, a second shaft revolubly and slidably mounted at right angles to said cam shaft, a worm and worm gear connection between said cam shaft and second shaft, a cam to move said second shaft back and forth and means for turning said cam, and means for resiliently pressing said second shaft against said cam.

8. In a device of the character described, a saw and means for reciprocally moving said saw, a holding clamp revoluhly mounted alongside said saw, a shaft revolubly mounted adjacent to said clamp, a cam on said shaft adjacent said holding clamp to raise the same, a second shaft revolubly and slidably mounted at right angles to said cam shaft, a worm gear 011 said cam shaft and a worm on said second shaft, a yoke on said cam shaft to receive said worm and worm gear, a releasable catch on said yoke for said second shaft to drop said worm out of mesh with said worm gear, and means for oscillatively turning said second shaft.

9. In a device of the character described,

a saw and means for reciprocally moving the same, a first revolubly mounted shaft having an end adjacent said saw, a holding clamp on said adjacent shaft end, a second shaft revolubly mounted parallel to said first shaft, a cam on said second shaft adjacent said holding clamp toraise the same, a third shaft revolubly and slidably mounted at right angles to said second shaft, worm and gear connection between said second and third shafts, a friction disk on said third shaft, a fourth shaft revoluloly mounted parallel to said first and second shafts and across the end of said third shaft and means for turning said fourth shaft, a friction wheel on said fourth shaft to turn said disk and third shaft, a cam on said fourth shaft opposite the end of said slidably mounted third shaft to intermittently separate said friction wheel and disk and oscillatively move said third shaft, and means for pressing said third shaft against said cam on said fourth shaft.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

KARL PETERSON. lVitnesses:

A. W. KETTLE, I. A. ELLswoRTH.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. C. 

